using System.Runtime.InteropServices;[DllImport("sde.dll")]//还有其他的属性可参考MSDNpublic static extern Int32 SE_connection_create(string server, string instance, string database, string username, string pwd, ref SE_ERROR error, out IntPtr pSdeConn);
Imports System.Runtime.InteropServices<DllImport("sde.dll", SetLastError:=True, ThrowOnUnmappableChar:=True)> _
Public Shared Function SE_connection_create(ByVal server As String, ByVal instance As String,ByVal database As String, ByVal username As String, ByVal password As String, ByRef error1 As SE_ERROR,ByRef connection As IntPtr) As Int32
End Function
<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
Public Structure SE_ERROR
Public sde_error As Int32
Public ext_error As Int32
'<MarshalAs(UnmanagedType.ByValArray, SizeConst:=512)> _
Public err_msg1 As Char()
'<MarshalAs(UnmanagedType.ByValArray, SizeConst:=4096)> _
Public err_msg2 As Char()
End Structure
'--------------↑声明SE_ERROR结构体↑-----------------
'-------------------调用SE_connection_create函数----------------------
'------------------连接SDE-------------------------
'返回结果
'SE_SUCCESS 0
'SE_FAILURE -1
'SE_NO_ACCESS -15
'SE_SDE_NOT_STARTED -5
'SE_IOMGR_NOT_AVAILABLE -101
'SE_INVALID_DATABASE -162
'SE_INVALID_SERVER -100
'SE_INVALID_POINTER -65
'SE_INVALID_USER -9
'SE_LOGIN_NOT_ALLOWED -8
'SE_DBMS_DOES_NOT_SUPPORT -1008
'SE_NET_FAILURE -10
'SE_NET_TIMEOUT -11
'SE_SERVICE_NOT_FOUND -102
'SE_TASKS_EXCEEDED -7
<DllImport("sde.dll", SetLastError:=True,ThrowOnUnmappableChar:=True)> _
Public Shared Function SE_connection_create(ByVal server As String, ByVal instance As String, _
ByVal database As String, ByVal username As String, ByVal password As String, ByRef error1 As SE_ERROR, _
ByRef connection As IntPtr) As Int32
End Function
'----------------------------调用SE_connection_free函数-------------------------
'----------------------------释放SDE连接----------------------
<DllImport("sde.dll", SetLastError:=True, ThrowOnUnmappableChar:=True)> _
Public Shared Sub SE_connection_free(ByVal Byrefconnection As IntPtr)
End Sub
Imports QHProject.SDE_C_API
Imports System.Runtime.InteropServices
Partial Class MapServicePage
Inherits System.Web.UI.Page
Private Shared conn As IntPtr = Nothing
Private error1 As QHProject.SDE_C_API.SDE_C_API_Operation.SE_ERROR = Nothing
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Int32 = SDE_C_API_Operation.SE_connection_create("CL", "5151", "sde", "sde", "clbeyond", error1, conn)
Button1.Text = i.ToString()
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
SDE_C_API_Operation.SE_connection_free(conn)
End Sub
End Class
连接成功后Button的Text属性会显示为0，表示连接成功，在任务管理器中就会发现出现了一个gsrvr.ext进程。断开连接后gsrvr.exe进程就会消失。
当然前提是要在程序中将连接字段conn声明为shared类型（C#中的Static类型）。
需要注意的是Instance不是"esri_sde"，而是端口号，一般为5151。
2008年3月10日15:41:31
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